Adoption of iOS 8 (which needed as much as 4.7GB free to install) has been slower than with other updates to the platform. Apple doesn’t say how much the required space was reduced, but we were able to install it on a 16GB iPad mini that only had 445MB of space available. Earlier updates required using iTunes on a Mac or PC to update this iPad.

In addition to lowering the storage requirements for updates, iOS 8.1.3 fixes issues with Apple ID logins, multitasking gestures on the iPad, and bugs in Spotlight search results. It also adds configuration options for educators and standardized testing. The update can be downloaded via the Settings app now.

Jailbreak user should avoid the update as it seems Apple have fixed the bugs which lead to jailbreak.